36 results about "Pb contamination" patented technology

The invention discloses engineered remediation equipment and remediation method for heavy metal arsenic and lead contaminated soil. The remediation equipment comprises a slurry making system, a screening and washing system, a leaching and leaching system and a dehydration system which are connected in sequence. The remediation method comprises the steps: (1) preparing slurry; (2) screening and washing; (3) leaching and extracting; and (4) dehydrating. Key parameters such as a slurry-making water-soil ratio, a screening and washing water-soil ratio and an agent leaching liquid-solid ratio are improved, meanwhile, according to the nature of south and north soil, south clay soil is more beneficial to attachment of arsenic, lead and other heavy metals, and the particle size grading limit of screening and washing and agent leaching in the remediation process is defined; economic cost accounting is carried out on the process, the engineered remediation equipment and remediation method for the heavy metal arsenic and lead contaminated soil are provided, and the remediation efficiency of the soil can be economically and effectively improved.

The invention discloses a novel method and a reagent for in-situ stabilizing repairing of lead polluted sediment by using an iron-based material synergistic microbes. The reagent comprises the iron-based material and a sulfate-reducing bacterium solution, and the iron-based material is prepared by reacting an iron-containing silicate mineral with oxalic acid in an aqueous medium at 55-120 DEG C. The reagent is added to the lead-polluted sediment, so the lead immobilization efficiency is 97% or above, the repairing is carried out in situ without an additional device, and the reagent and the method have the advantages of high lead stabilizing efficiency, low cost and no secondary pollution.

The invention discloses a strain of Trichoderma asperellum. The strain has been preserved in the General Microorganism Center of China Microbiological Culture Collection Management Committee on January 22, 2018, and its biological preservation number is: CGMCC NO.15266. The trichoderma asperellum (Trichoderma asperellum) screened and isolated by the present invention has excellent tolerance and adsorption capacity to various heavy metals, especially lead, and is easy to colonize in soil polluted by heavy metals, especially in soil polluted by lead. Survival, suitable for microbial remediation of soil.

The invention relates to a method for reducing pollutions to amaranths by heavy metals of cadmium and lead in soil, which comprises the following steps: firstly, screening an amaranth pollution strategy variety (Cd+Pb-PSC) with low accumulation of the cadmium and the lead; and secondly, planting the amaranth pollution strategy variety (Cd+Pb-PSC) with the low accumulation of the cadmium and the lead, and cooperatively employing a special soil conditioner for inhibiting the amaranth pollution strategy variety (Cd+Pb-PSC) with the low accumulation of the cadmium and the lead from absorbing the cadmium and the lead in the planting process. The method of the invention effectively reduces the absorption of Cd and Pb by the amaranths and reduces the pollutions to the amaranths by the heavy metals of the cadmium and the lead in the soil by screening the amaranth pollution strategy variety (Cd+Pb-PSC) with the low accumulation of the cadmium and the lead and employing the special soil conditioner for inhibiting the amaranth pollution strategy variety (Cd+Pb-PSC) with the low accumulation of the cadmium and the lead from absorbing the cadmium and the lead.

The invention discloses a device and method for in-situ restoration of cadmium and lead polluted farmland soil by microbial electrochemically enhanced sulfate reduction. The present invention utilizes sulfate reduction reactor to produce sulfur-containing (S 2‑ ) Water-based passivation agent, which can repair cadmium and lead-contaminated farmland soil in situ, and convert cadmium and lead into forms that are difficult to be absorbed by crops. By constructing a double-chamber sulfate reduction reactor, the application of electric current promotes the hydrogen production reaction in the cathode chamber, and the autotrophic sulfate-reducing bacteria in the cathode chamber can use the hydrogen generated by the electrode electrolysis of water and the inorganic carbon source to reduce sulfate. for S 2‑ . The containing S 2‑ The passivator mixed with soil can reduce the toxicity of cadmium and lead in farmland soil. The invention uses the liquid passivating agent to remediate the cadmium- and lead-contaminated farmland soil without causing obvious changes in the physical and chemical properties of the soil, and has obvious advantages compared with the remediation of the heavy metal-contaminated soil by using quicklime, biochar and the like.

The invention discloses a strain of phosphate-solubilizing bacteria which is preserved in China general microbiological culture collection center (CGMCC) and is named as enterobacter agglomerans RKMC-7 in a classification way with the preservation number of CGMCC No. 5005. After a bactericide containing the enterobacter agglomerans is inoculated into the soil polluted by lead, the exchangeable form lead can be promoted to be fixed, and the fixing efficiency is 77-91.4%. The bactericide is simple in preparation method, rich in material source and easy in implementation of large-scale production, can realize the effect of carrying out agricultural production while repairing, and has important significance for guaranteeing grain safety and environmental protection.

The invention discloses an application and method for using glutamine treatment to inhibit the absorption of heavy metal Pb by plants, reduce the heavy metal pollution of vegetables, and reduce the damage and growth inhibition of vegetables by Pb. The present invention utilizes glutamine treatment to inhibit plants from absorbing Pb in the soil, and by applying 10 mmol / L glutamine to vegetables such as pakchoi grown in different Pb-contaminated soils, it can effectively inhibit the absorption of Pb from the soil by pakchoi and reduce Pb Accumulate in the roots, stems and leaves of Chinese cabbage to reduce Pb pollution in Chinese cabbage.

The present invention relates to a soil in situ passivating agent, and in particular to a surface in situ remediation method of lead-contaminated soil, a passivating agent and a preparation method thereof, and belongs to the technical field of environmental engineering. The passivating agent comprises 50-80% of slag, 10-16% of cement clinker and 10-34 % of rice hull ash; and the raw materials are mixed and milled, and the specific surface area of the milled powder is controlled at higher than 800m<2> / kg, so as to obtain the passivating agent. The passivating agent in the present invention mainly uses silicate hydrated gel phase for passivation consolidation on lead; the passivating agent has obvious curing effect on heavy metal lead in soil, can reduce the leaching concentration in early curing stage, carry out sustainable curing reaction in the middle and long term, can keep the leaching concentration in a decreasing trend; the raw materials are all from the typical industrial solid wastes, so as to utilize waste, treat pollution and help to reduce costs; therefore, the invention has significant economic and environmental benefits.